Illinois Vision Certification Practice Test

What type of correction is used for myopia?

1. Convex lenses

2. Concave lenses

3. Cylindrical lenses

4. Bifocal lenses

The correct answer is: Concave lenses

Myopia, commonly known as nearsightedness, is a vision condition where individuals can see nearby objects clearly, but objects farther away appear blurred. The primary reason this occurs is because the eye is either too long or the cornea is too curved, causing light rays to focus in front of the retina rather than on it. Concave lenses are specifically designed to correct this condition. These lenses have a thinner center and are wider at the edges, which helps to diverge light rays before they enter the eye. This divergence moves the focal point back onto the retina, allowing the person to see distant objects more clearly. In contrast, convex lenses are used for hyperopia (farsightedness), cylindrical lenses are primarily used for astigmatism, which corrects uneven curvature of the cornea or lens, and bifocal lenses are a combination designed to aid both near and far vision. Thus, the use of concave lenses is the appropriate correction for myopia, making it the correct choice in this context.